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Update your device's operating system regularly
The number of threats to your computer and mobile device is increasing every day. Many developers work hard to find weak spots (bugs) in the operating systems and create new viruses so that they can steal personal data from millions of users.
To be on the safe side, and as a good mobile device/computer virus protection apply the recently released updates once you receive a notification that there is one. DO NOT DOWNLOAD UPDATES from third-party websites because they might have been modified to harm you.
Keep the installed programs/applications up to date
Another way for a virus to infect your computer or mobile device is through an outdated software. Many people just install pieces of software, without checking for updates from time to time. An outdated software can be a way for hackers to gain access to your computer or mobile device as new types of computer virus are "born" on a daily basis.
Scan pieces of software and URLs using VirusTotal.com
VirusTotal is a website that provides free check-up for files and websites for viruses. It uses 55 different antivirus products and 61 online scan engines to check for viruses that the computer's or the mobile device's antivirus may have missed. This is a good way to prevent malwares from invading your computer and an answer to the "how to get rid of a computer virus (or of a mobile device one)" question.
Upload a file (up to 128 MB) or copy a URL you find suspicious. Based on analyses of all the softwares you will be informed whether the file or the URL is malicious and spare you from troubles.
Note: There are some files which may be recognised as viruses by SOME of the antiviruses, and they are actually not. Those files are known as false positives. So if a file is treated as a virus by small number of antiviruses (e.g 2 out of 10), then it is most likely a false positive file.
Phishing email messages, links, or phone calls are another way for a virus to find its way to your computer. You are asked to provide your credit card number, log in to Facebook (or other social network) through the email and etc.
The best way to protect yourself from phishing emails, and the best mobile device or computer virus protection in general, is to avoid opening them and READ THE TITLE CAREFULLY. So, if you notice an email that has a suspicious title and is sent from a suspicious email address, don't open it. Usually suspicious mails are directed to the Junk folder and valid emails are shown in the regular Inbox folder. However, there are some cases where valid emails are shown in the junk folder.
Also, ignore emails that inform you that you've won a contest or emails from a stranger asking for assistance with their inheritance.
Note: If you are not sure how to recognise a phishing email, read this tutorial. If you are still not able to recognise a phishing email, consider installing an antivirus software which will delete phishing emails automatically.
People are aware that there are many websites out there designed to steal their data; However, the hardest part is to identify those websites. Usually those websites offer paid versions of popular softwares (such as antiviruses, games etc.), or an easy way for making money without effort. Once you open the website you will be asked to install a piece of software that allegedly improves your browsing experience. Do not accept it because not only does it not improve your browsing experience, but also it infects your computer or mobile device.
If you are not sure whether a website is safe or not, you can check it with virustotal's engine. Virustotal is a website that provides free check-up for files and websites for viruses. It uses 55 different antivirus products and 61 online scan engines to check for viruses that the computer's antivirus may have missed.
All you need to do is to copy the link of the suspicious website in the designated field and wait for the results.
Avoid suspicious ads (advertisements) on websites
If you wonder how to protect computer from virus or how to protect your mobile device, you should avoid clicking on suspicious ads. Unfortunately, they are on every second website you visit, waiting for you to click them. They offer you money, free mobile devices (usually iPhones), vacations and countless stuff. But the only thing you actually get for free is a malware, and an empty credit card.
The best way to protect yourself from ads is to avoid opening them. Remember that there is no such thing as free lunch. Also, consider installing a good antivirus software that will protect you from suspicious ads.
Check an application's permissions before installing it on your mobile device. If you notice something suspicious (i.e, a game requires access to your camera), don't install it.
Before you install an Android application via Google Play(store), you will be shown what permissions the application requires:
Note: You cannot change the application's permissions on an Android mobile device, however, you can check them so that you decide whether you will install a particular application or not (via Google Play Store).